External prestressing tendon anchoring device for lower part of box girder bridge

Abstract

The utility model discloses a box girder bridge lower portion external prestressing tendon anchoring device which comprises external prestressing anchoring assemblies distributed on the two sides of a concrete box girder, and the two external prestressing anchoring assemblies arranged in the length direction of the concrete box girder are fixedly connected through external prestressing tendons. An anchoring area is formed in the area between the lower portion of the concrete box girder and the external prestressing anchoring assembly, and the external prestressing tendons penetrate through the anchoring area. The anchoring device for the external prestressing tendon at the lower part of the box girder bridge is an external prestressing reinforcing device which is more efficient, more convenient and less in damage to the original structure, can effectively improve the bearing capacity and durability of the lower part structure of the box girder bridge, and has good economic benefits and social benefits.

Description

Technical Field

[0001] This utility model relates to the field of box girder bridge construction technology, specifically to an external prestressing tendon anchorage device for the lower part of a box girder bridge. Background Technology

[0002] Box girder bridges, a common type of bridge structure in modern transportation infrastructure, are widely used on various major transportation routes due to their excellent mechanical properties and space utilization efficiency. However, during long-term service, box girder bridges are continuously subjected to repeated traffic loads and the effects of the natural environment (such as temperature changes, humidity erosion, and chemical corrosion), inevitably leading to problems such as crack initiation and propagation, and excessive deflection. These problems not only seriously threaten the safety of the bridge structure but also significantly reduce its durability, thereby affecting the normal use and service life of the bridge.

[0003] External prestressing reinforcement technology, as an effective method in the field of bridge reinforcement, can significantly improve the structural performance of box girder bridges by applying prestress to the exterior of the structure. Specifically, this technology can effectively offset some of the tensile stress generated by dead and live loads, reduce the generation and development of cracks, and increase the stiffness of the bridge structure, thereby enhancing the bridge's load-bearing capacity and durability. Furthermore, external prestressing reinforcement technology also has significant advantages such as convenient construction and minimal impact on traffic, leading to its widespread application and promotion in numerous box girder bridge reinforcement projects.

[0004] Despite the numerous advantages that external prestressing technology has demonstrated in the reinforcement of box girder bridges, existing external prestressing devices and methods still reveal several problems that urgently need to be addressed in practical applications. Among these, the complexity of the anchoring system is particularly prominent. Traditional external prestressing methods typically require drilling into the top slab or web of the box girder bridge to install anchorages. This construction process is not only technically demanding and difficult, but it also inevitably causes significant damage to the original structure, increasing structural safety risks and potentially affecting the bridge's aesthetics and durability. Furthermore, the complex anchoring system leads to extended construction periods and increased costs, limiting the further development and application of external prestressing technology.

[0005] Therefore, developing a more efficient, convenient, and less damaging external prestressed reinforcement device has become an important research direction and a key issue that urgently needs to be addressed in the field of bridge reinforcement. Utility Model Content

[0006] In response to the existing technical problems, this utility model provides an external prestressing tendon anchorage device for the lower part of a box girder bridge, in order to solve the problems in the prior art.

[0007] To achieve the above-mentioned objectives, this utility model provides the following technical solution:

[0008] An external prestressing tendon anchoring device for the lower part of a box girder bridge includes external prestressing anchoring components distributed on both sides of a concrete box girder. Two sets of external prestressing anchoring components arranged along the length of the concrete box girder are fixedly connected by external prestressing tendons. An anchoring zone is formed between the lower part of the concrete box girder and the external prestressing anchoring components, and the external prestressing tendons are arranged through the anchoring zone.

[0009] Preferably, a prestressed anchor rod is provided between the two sets of external prestressed anchoring components arranged along the width direction of the concrete box girder, and the two ends of the prestressed anchor rod are respectively connected to the external prestressed anchoring components at the corresponding ends.

[0010] Preferably, the external prestressed anchoring assembly includes an anchoring steel plate, an outer steel plate, and a limiting plate. The anchoring steel plate is arranged vertically and connected to the web of the concrete box girder. The lower end of the anchoring steel plate extends downward beyond the lower end of the concrete box girder. The limiting plate is connected to the anchoring steel plate, and the upper end face of the limiting plate abuts against the lower end face of the concrete box girder. Anchoring steel plate grid assemblies are distributed on the outer steel plate, and the outer steel plate is connected to the anchoring steel plate through the anchoring steel plate grid assemblies.

[0011] Preferably, the outer steel plate is arranged parallel to the anchoring steel plate.

[0012] Preferably, the two ends of the prestressed anchor rod pass through the anchoring steel plate and the outer steel plate at the corresponding ends, and a lower pad and a fastening nut are installed at the end of the prestressed anchor rod.

[0013] Preferably, it also includes a force-transmitting steel plate, which is installed between the two opposite surfaces of the anchoring steel plate and the outer steel plate.

[0014] Preferably, the assembly also includes a force-transmitting steel plate and a lower anchor point steel plate located below the concrete box girder. One end of the force-transmitting steel plate is connected to the anchoring steel plate, and the other end is connected to the lower anchor point steel plate. The prestressed tendon passes through the anchoring area and is connected to the force-transmitting steel plate.

[0015] Preferably, the anchoring steel plate grid assembly includes transverse stiffening plates and vertical stiffening plates distributed on both sides of the outer steel plate, and the outer steel plate is connected to the anchoring steel plate through the transverse stiffening plates and vertical stiffening plates.

[0016] Compared with the prior art, the beneficial effects of this utility model are as follows: The external prestressing tendon anchorage device for the lower part of the box girder bridge in this solution is a more efficient, convenient external prestressing reinforcement device with less damage to the original structure. Through this device, the load-bearing capacity and durability of the lower part of the box girder bridge can be effectively improved, which has good economic and social benefits. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of the external prestressing tendon anchorage device for the lower part of the box girder bridge according to this utility model;

[0018] Figure 2 for Figure 1 Front view of the assembly with the concrete box girder;

[0019] Figure 3 for Figure 2 Side view;

[0020] Figure 4 for Figure 2 Sectional view at point A in the diagram;

[0021] Figure 5 for Figure 2 The cross-sectional view at point B in the diagram. Detailed Implementation

[0022] The present invention will be further described in detail below with reference to experimental examples and specific embodiments. However, this should not be construed as limiting the scope of the above-mentioned subject matter of the present invention to the following embodiments. All technologies implemented based on the content of the present invention fall within the scope of the present invention.

[0023] In the description of this utility model, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0024] As attached Figure 1 -Appendix Figure 5The diagram illustrates an external prestressing tendon anchoring device for a box girder bridge, comprising external prestressing anchoring components 2 distributed on both sides of a concrete box girder 1. Two sets of external prestressing anchoring components 2, arranged along the length of the concrete box girder 1, are fixedly connected by external prestressing tendons 3. An anchoring zone 4 is formed between the lower part of the concrete box girder 1 and the external prestressing anchoring components 2. The external prestressing tendons 3 pass through this anchoring zone 4. The concrete box girder 1 is clamped by the two sets of external prestressing anchoring components 2 arranged along the width of the concrete box girder 1, and then tensioned by the external prestressing tendons 3 between the two sets of external prestressing anchoring components 2 arranged along the length of the concrete box girder 1, thereby providing prestressing force to the concrete box girder 1.

[0025] The external prestressed anchoring assembly 2 includes an anchoring steel plate 6, an outer steel plate 7, and a limiting plate 15. The anchoring steel plate 6 is arranged vertically, and the outer steel plate 7 is arranged parallel to the anchoring steel plate 6 and located outside the anchoring steel plate 6. The anchoring steel plate 6 is bolted to the web of the concrete box girder 1, and the lower end of the anchoring steel plate 6 extends downward beyond the lower end of the concrete box girder 1. The limiting plate 15 is connected to the anchoring steel plate 6, and the upper end face of the limiting plate 15 abuts against the lower end face of the concrete box girder 1. The limiting plate 15 and the anchoring steel plate 6 cooperate to effectively grip the web and bottom plate of the concrete box girder 1, ensuring that the limiting plate 15 and the anchoring steel plate 6 will not shift during tensioning, thereby ensuring the tensioning effect.

[0026] Figure 4 , Figure 5 Combination Figure 2 As can be seen, anchoring steel plate grid assemblies are distributed on the outer steel plate 7. These assemblies ensure uniform force transmission. In this embodiment, the anchoring steel plate grid assembly includes transverse stiffening plates 8 and vertical stiffening plates 10 distributed on both sides of the outer steel plate 7, and the outer steel plate 7 is connected to the anchoring steel plate 6 through these transverse stiffening plates 8 and vertical stiffening plates 10. A force-transmitting steel plate 9 is installed between the two opposite surfaces of the anchoring steel plate 6 and the outer steel plate 7.

[0027] Figure 1 , Figure 2 Combination Figure 4As can be seen, prestressed anchor rods 11 are provided between the two sets of external prestressed anchoring components 2 arranged along the width direction of the concrete box girder 1. The two ends of the prestressed anchor rod 11 are respectively connected to the corresponding ends of the external prestressed anchoring components 2. Specifically, the two ends of the prestressed anchor rod 11 pass through the corresponding ends of the anchoring steel plate 6 and the outer steel plate 7, respectively. A lower pad 13 and a fastening nut 12 are installed at the end of the prestressed anchor rod 11. By tightening the prestressed anchor rod fastening nut 12, the pressure generated by the prestressed anchor rod 11 is evenly transmitted to the anchoring interface of the anchoring steel plate 6 through the outer steel plate 7 and the anchoring steel plate grid assembly, so that the anchoring steel plate 6 is tightly pressed together with the outer surface of the web and bottom plate of the concrete box girder 1, thereby making the external prestressed anchoring components 2 firmly anchored to the concrete box girder 1.

[0028] Below the concrete box girder 1, there is also a force-transmitting steel plate 5 and a lower anchor point steel plate 14. One end of the force-transmitting steel plate 5 is connected to the anchoring steel plate 6, and the other end is connected to the lower anchor point steel plate 14. The prestressed tendon 3 passes through the anchoring area 4 and is connected to the force-transmitting steel plate 5.

[0029] For other details not specifically mentioned, please refer to existing technologies; they will not be described in further detail here.

[0030] The preferred embodiments of this utility model have been described above. It should be understood that those skilled in the art can make numerous modifications and variations based on the concept of this utility model without creative effort. Therefore, all technical solutions that can be obtained by those skilled in the art based on the concept of this utility model through logical analysis, reasoning, or limited experimentation on the basis of existing technology should be within the scope of protection defined by the claims.

Claims

1. An anchoring device for external prestressing tendons in the substructure of a box girder bridge, characterized in that: The structure includes external prestressed anchorage components (2) distributed on both sides of the concrete box girder (1). Two sets of external prestressed anchorage components (2) are fixedly connected by external prestressed tendons (3) along the length direction of the concrete box girder (1). An anchorage zone (4) is formed between the lower part of the concrete box girder (1) and the external prestressed anchorage components (2). The external prestressed tendons (3) are set through the anchorage zone (4).

2. The external prestressing tendon anchorage device for the lower part of a box girder bridge according to claim 1, characterized in that: Two sets of external prestressed anchoring components (2) are provided with prestressed anchor rods (11) between them along the width direction of the concrete box girder (1). The two ends of the prestressed anchor rods (11) are respectively connected to the external prestressed anchoring components (2) at the corresponding ends.

3. The external prestressing tendon anchorage device for the lower part of a box girder bridge according to claim 2, characterized in that: The external prestressed anchoring assembly (2) includes an anchoring steel plate (6), an outer steel plate (7), and a limiting plate (15). The anchoring steel plate (6) is arranged vertically and is connected to the web of the concrete box girder (1). The lower end of the anchoring steel plate (6) extends downward from the lower end of the concrete box girder (1). The limiting plate (15) is connected to the anchoring steel plate (6) and the upper end face of the limiting plate (15) abuts against the lower end face of the concrete box girder (1). Anchoring steel plate grid assemblies are distributed on the outer steel plate (7), and the outer steel plate (7) is connected to the anchoring steel plate (6) through the anchoring steel plate grid assemblies.

4. The external prestressing tendon anchorage device for the lower part of a box girder bridge according to claim 3, characterized in that: The outer steel plate (7) is arranged parallel to the anchoring steel plate (6).

5. The external prestressing tendon anchorage device for the lower part of a box girder bridge according to claim 4, characterized in that: The prestressed anchor rod (11) has two ends that pass through the anchoring steel plate (6) and the outer steel plate (7) respectively. A lower pad (13) and a fastening nut (12) are installed at the end of the prestressed anchor rod (11).

6. The external prestressing tendon anchorage device for the lower part of a box girder bridge according to claim 5, characterized in that: It also includes a force transmission steel plate (9), which is installed between the two opposite surfaces of the anchoring steel plate (6) and the outer steel plate (7).

7. An anchorage device for external prestressing tendons in the lower part of a box girder bridge according to any one of claims 3-5, characterized in that: It also includes a force-transmitting steel plate (5) and a lower anchor plate (14) located below the concrete box girder (1). One end of the force-transmitting steel plate (5) is connected to the anchor plate (6), and the other end is connected to the lower anchor plate (14). The prestressed tendon (3) passes through the anchoring area (4) and is connected to the force-transmitting steel plate (5).

8. An anchorage device for external prestressing tendons in the lower part of a box girder bridge according to any one of claims 3-6, characterized in that: The anchoring steel plate grid assembly includes a transverse stiffening plate (8) and a vertical stiffening plate (10) distributed on both sides of the outer steel plate (7), and the outer steel plate (7) is connected to the anchoring steel plate (6) through the transverse stiffening plate (8) and the vertical stiffening plate (10).

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